NEET Biology is the scoring paper in the medical entrance examination. Here, you will discover the NEET Biology MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Biology objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Biology Linkage and Crossing Over Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.
MCQs on Linkage and Crossing Over
1. Crossing-over takes place in the
(a) Diakinesis stage
(b) Anaphase stage
(c) Pachytene stage
(d) Leptotene stage
Answer
Answer: (c)
2. There are 4 pairs of chromosomes in a Drosophila. The linkage groups present in it are
(a) one more than the pair of chromosomes
(b) one less than the pair of chromosomes
(c) four
(d) eight
Answer
Answer: (c)
3. Percentage of crossing over is more when
(a) genes are located in a different cell
(b) genes are not linked
(c) linked genes are located close to each other
(d) linked genes are located far apart from each other
Answer
Answer: (d)
4. If the percentage of crossing over between two genes is 10, then the distance between two genes will be
(a) 5 morganoid
(b) 10 morgan
(c) 20 centimorgans
(d) 40 map units
Answer
Answer: (b)
5. Alleles of different genes that are on the same chromosome can occasionally be separated by a phenomenon called
(a) crossing over
(b) continuous variation
(c) epistasis
(d) pleiotropy
Answer
Answer: (a)
6. Repulsion and coupling are two faces of
(a) mutation
(b) chiasmata
(c) linkage
(d) crossing over
Answer
Answer: (c)
7. If gene frequency between genes a and c is 2%; b and c is 13%; b and d 4%; a and b 15%; c and d 17 and a and d 19%. The sequence of genes in a chromosome is
(a) a,d,b,c
(b) d,b,a,c
(c) a,b,c,d
(d) a,c,b,d
Answer
Answer: (d)
8. This is the reason why Mendel did not recognize linkage phenomenon in his experiments
(a) he studied only pure plants
(b) he did not have a powerful microscope
(c) characters he studied were situated on different chromosomes
(d) many chromosomes to handle
Answer
Answer: (c)
9. In a linear chromosome map distance between 4 loci is as follows a-b is 10%, a-d is 3%, b-c is 4% and a-c is 6%. The crossover frequency between c and d is
(a) 4-12%
(b) 3-6%
(c) 9%
(d) 3%
Answer
Answer: (d)
10. Where does this evidence come from? – crossing over takes place at a four-stranded stage and not at two stranded stages of chromosomes.
(a) studies on linkage maps of chromosomes in Drosophila
(b) studies of meiosis in maize
(c) 4:4 organization of ascospores in Neurospora
(d) 2:2:2:2 organization of ascospores in Neurospora
Answer
Answer: (d)